Creates a new barrier that can block a given number of threads.

A barrier will block n-1 threads which call wait and then wake up all threads at once when the nth thread calls wait.

Examples

use std::sync::Barrier;

let barrier = Barrier::new(10);

Blocks the current thread until all threads have rendezvoused here.

Barriers are re-usable after all threads have rendezvoused once, and can be used continuously.

A single (arbitrary) thread will receive a BarrierWaitResult that returns true from is_leader when returning from this function, and all other threads will receive a result that will return false from is_leader.

Examples

use std::sync::{Arc, Barrier};
use std::thread;

let mut handles = Vec::with_capacity(10);
let barrier = Arc::new(Barrier::new(10));
for _ in 0..10 {
    let c = barrier.clone();
    // The same messages will be printed together.
    // You will NOT see any interleaving.
    handles.push(thread::spawn(move|| {
        println!("before wait");
        c.wait();
        println!("after wait");
    }));
}
// Wait for other threads to finish.
for handle in handles {
    handle.join().unwrap();
}

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